For now, that's DeepSeek: https://api-docs.deepseek.com/quick_start/pricing/ (they have a discount until the end of the month, even after that they will have pretty good prices)
Or GLM or Kimi, Mistral is also surprisingly passable. Or just have to open the wallet and give money to OpenAI or Anthropic for the subsidized tokens.
> Google Enterprise accounts are sunsetting AI Ultra in favor of consumption based pricing at the end of the month.
This whole thing feels a bit like what GitHub did with Copilot, though.